[ceph-users] Monitor disks for SSD only cluster

Wido den Hollander wido at 42on.com
Mon Nov 26 05:27:11 PST 2018



On 11/26/18 2:21 PM, Gregory Farnum wrote:
> As the monitors limit their transaction rates, I would tend for the
> higher-durability drives. I don't think any monitor throughput issues
> have been reported on clusters with SSDs for storage.

I can confirm that. Just make sure you have proper Datacenter Grade
SSDs. Don't go crazy with buying the most expensive ones, but stay away
from consumer grade SSDs.

Just make sure you have at least 100GB of free space should the MON
databases grow to a large size.

Wido

> -Greg
> 
> On Mon, Nov 26, 2018 at 5:47 AM Valmar Kuristik <valmar at eenet.ee
> <mailto:valmar at eenet.ee>> wrote:
> 
>     Hello,
> 
>     Can anyone say how important is to have fast storage on monitors for a
>     all ssd deployment? We are planning on throwing SSDs into the monitors
>     as well, but are at a loss about if to go for more durability or speed.
>     Higher durability drives tend to be a lot slower for the 240GB size
>     we'd
>     need on the monitors, while lower durability would net considerably
>     more
>     write speed.
> 
>     Any insight into this ?
> 
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